I don’t know if this is possible and I can see why it may not be but …. If I create a snippet and add input boxes then I get an error of “widget can only function inside a data container”. On a page, I can add a data view and then use the snippet. That does not give any errors. But of course I still have my snippet showing errors. If I use a data container in a snippet then the error is that data containers can only be used on a page. Is there a way of doing this without the errors?
Did you set the entity inside the snippet? Otherwise, you cannot select the attribute for the input box.
This is essentially the same as setting an enitity inside a dataview.